An anonymous reader writes: The second of two lawsuits filed against the U.S. government regarding domestic mass surveillance, ACLU vs. Clapper was heard on Tuesday by 'a three-judge panel on the U.S. Court of Appeals for the 2nd Circuit'. The proceeding took an unprecedented two hours (the norm is about 30 minutes), and C-SPAN was allowed to record the whole thing and make the footage available online. ACLU's lawyers argued that mass surveillance without warrants violates the 4th Amendment, while lawyers for the federal government argued that provisions within the Patriot Act that legalize mass surveillance without warrants have already been carefully considered and approved by all three branches of government. The judges have yet to issue their ruling.